Add 7 articles; update nav and existing articles (2026-04-25)
New articles:
- pihole-doh-dot-bypass-defense
- pihole-v6-adlist-management
- mastodon-db-maintenance
- mastodon-federation
- fantastical-google-phantom-calendar-syncselect
- rsync-tailscale-teardown-stall
- ollama-chat-template-pipe-stdin-bypass
Updated: wsl2-backup, wsl2-rebuild, ssh-config-key-management,
selfhosting index, mastodon-instance-tuning, ansible-check-mode,
windows-openssh, windows-sshd, yt-dlp, README, SUMMARY, index
Removed: fedora-usrmerge-ebtables-blocker (superseded by prior push)
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